On Mon, Oct 09, 2017 at 11:55:31PM +0200, Max Reitz wrote: > A qcow2 image file's length is not required to have a length that is a > multiple of the cluster size. However, qcow2_refcount_area() expects an > aligned value for its @start_offset parameter, so we need to round > @old_file_size up to the next cluster boundary. > > Reported-by: pingl <pi...@redhat.com> > Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1414049 > Signed-off-by: Max Reitz <mre...@redhat.com> > --- > block/qcow2.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/block/qcow2.c b/block/qcow2.c > index 2f6a8e1ff8..c3b312cdef 100644 > --- a/block/qcow2.c > +++ b/block/qcow2.c > @@ -3193,6 +3193,7 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t > offset, > "Failed to inquire current file length"); > return old_file_size; > } > + old_file_size = ROUND_UP(old_file_size, s->cluster_size); > > nb_new_data_clusters = DIV_ROUND_UP(offset - old_length, > s->cluster_size); > -- > 2.13.6 > >
Reviewed-by: Jeff Cody <jc...@redhat.com>
